Malicious PDF — malware analysis report

Static analysis result for SHA-256 758f08dfb6a73a0f…

MALICIOUS

PDF

45.7 KB Created: 2020-04-13 09:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12edbcda44b7476d771680fa37ea63ba SHA-1: c981f8973d078ac11f6af4338ced3aaee47bfa36 SHA-256: 758f08dfb6a73a0fc49a8f7bb6debbae43073d25a500e270a40bc772680ce8bf
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or a SEO poisoning attack, designed to attract traffic or distribute malicious content. The primary URL, http://nashobavalleyextractco.com/uploads/1/3/0/7/130739791/130739791.html#learn+r+programming+language+online, is presented as educational content to entice clicks. No scripts were extracted, but the sheer volume of external links and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nashobavalleyextractco.com/uploads/1/3/0/7/130739791/130739791.html#learn+r+programming+language+online
    • http://barkwayboys.com/uploads/1/3/1/3/131379194/2582b6bf.pdf
    • http://fieldmanagerdevworkshop.com/uploads/1/3/0/7/130738830/pusipowudavamuv.pdf
    • http://arkansasclubvolleyball.com/uploads/1/3/0/9/130969527/2cf58d0225.pdf
    • http://birdsofdanjugan.com/uploads/1/3/1/3/131380569/voluxidimawofoda.pdf
    • http://aetherman.org/uploads/1/3/0/6/130639734/seledaxikavapu_vegedapet_rapale_girer.pdf
    • http://masterbarberrr.com/uploads/1/3/0/9/130969814/netuseloduxevoku.pdf
    • http://updogllc.com/uploads/1/3/1/4/131407995/kuliditinikej.pdf
    • http://ecoapothecary.com/uploads/1/3/0/3/130324289/bekiterokemoki.pdf
    • http://theamericanzoo.com/uploads/1/3/0/3/130379466/1704243b6.pdf
    • http://cynthiahyett.com/uploads/1/3/1/4/131407324/ledobojetawasa.pdf
    • http://gardenpartyclub.com/uploads/1/3/0/8/130874170/62c8fc.pdf
    • http://gravitt4tn.com/uploads/1/3/0/5/130551270/nirepisoseb.pdf
    • http://theamericanzoo.com/uploads/1/3/0/3/130379466/17042
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000898b.bin
2247b97678fd7c32901d74253a6b689ed4e9e4a1e83454f6b32f4545029d8a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898B 8184 bytes

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